#region Copyright (c) 2003 - 2008, Andreas Mueller
/////////////////////////////////////////////////////////////////////////////////////////
// 
// Copyright (c) 2003 - 2008, Andreas Mueller.
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// which accompanies this distribution, and is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// Contributors:
//    Andreas Mueller - initial API and implementation
//
// 
// This software is derived from software bearing the following
// restrictions:
// 
// Copyright (c) 1994
// Hewlett-Packard Company
// 
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appear in all copies and
// that both that copyright notice and this permission notice appear
// in supporting documentation.  Hewlett-Packard Company makes no
// representations about the suitability of this software for any
// purpose.  It is provided "as is" without express or implied warranty.
// 
// 
// Copyright (c) 1996,1997
// Silicon Graphics Computer Systems, Inc.
// 
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appear in all copies and
// that both that copyright notice and this permission notice appear
// in supporting documentation.  Silicon Graphics makes no
// representations about the suitability of this software for any
// purpose.  It is provided "as is" without express or implied warranty.
// 
// 
// (C) Copyright Nicolai M. Josuttis 1999.
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
// 
/////////////////////////////////////////////////////////////////////////////////////////
#endregion
using System.Collections;
using System.Collections.Generic;
using NStl.Iterators;
using NStl.Iterators.Support;
using NStl.Linq;
using NUnit.Framework;
using NUnit.Framework.SyntaxHelpers;

namespace NStl.NUnit.AlgorithmFixtures.RandomSample
{
    public abstract class RandomSampleNBaseFixture : AlgorithmBaseFixture
    {
        protected abstract OutIt
            DoRandomSampleN<T, OutIt>(IInputIterator<T> first, IInputIterator<T> last, OutIt target, int n)
            where OutIt : IOutputIterator<T>;
        [Test]
        public override void SuccessfullPass()
        {
            int[] samples = new[] { 0, 1, 2, 3, 4, 5 };
            LinkedList<int> target = new LinkedList<int>();
            target.Resize(10);

            LinkedListIterator<int> it =
                DoRandomSampleN(samples.Begin(), samples.End(),
                                        target.Begin(), 6);

            ICollection randNumbers = target.Begin().AsCollection(it);
            Assert.That(randNumbers, Is.EquivalentTo(samples));

            ICollection untouched = it.AsCollection(target.End());
            Assert.That(untouched, Is.EqualTo(new[] { 0, 0, 0, 0 }));
        }

        [Test]
        public void SuccessfullPassWithShorterTarget()
        {
            int[] samples = new[] { 0, 1, 2, 3, 4, 5 };
            LinkedList<int> target = new LinkedList<int>();
            target.Resize(3);

            LinkedListIterator<int> it =
                DoRandomSampleN(samples.Begin(), samples.End(),
                                        target.Begin(), 3);

            Assert.That(it, Is.EqualTo(target.End()));

            Assert.That(target, Is.SubsetOf(samples));
        }

        public override void NonSuccessfullPass()
        {
            throw new System.Exception("The method or operation is not implemented.");
        }
        [Test]
        public override void StartIteratorIsEqualToEndIterator()
        {
            int[] samples = new[] { 0, 1, 2, 3, 4, 5 };
            LinkedList<int> target = new LinkedList<int>();
            target.Resize(10);

            LinkedListIterator<int> it =
                DoRandomSampleN(samples.Begin(), samples.Begin(),
                                        target.Begin(), 6);

            Assert.That(it.Value, Is.EqualTo(0));
            Assert.That(target, Is.All.EqualTo(0));

        }
    }
}